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Continuous caudal anesthesia for inguinal hernia repair in former preterm infants.

STUDY OBJECTIVE: To determine the feasibility of continuous caudal anesthesia with 2-chloroprocaine in conscious former preterm infants undergoing inguinal hernia repair.

DESIGN: Prospective study.

SETTING: University-affiliated children's hospital.

PATIENTS: Ten former preterm infants, ASA physical status II and III, who were 35 to 49.5 weeks postconceptional age at the time of surgery.

INTERVENTIONS: Caudal anesthesia was administered via an indwelling catheter using a loading dose of 1 ml/kg (30 mg/kg) of 3% 2-chloroprocaine, followed by incremental doses of 0.3 ml/kg (9 mg/kg) to achieve a level of T4 to T2. The block was maintained by a minimum infusion rate of 30 mg/kg/hr (1 ml/kg/hr) of the same local anesthetic solution.

MEASUREMENTS AND MAIN RESULTS: The mean cumulative dose of 2-chloroprocaine was 2.8 +/- 1.0 ml/kg/hr (84 +/- 30 mg/kg/hr) infused over a mean duration of 95 +/- 35 minutes. Serum cholinesterase concentration and plasma 2-chloroprocaine concentration were measured in five infants.

CONCLUSIONS: Three percent 2-chloroprocaine can be used effectively for continuous caudal anesthesia in conscious, former preterm infants for inguinal hernia and penoscrotal surgical procedures lasting 85 to 170 minutes.

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